
    public class Example22 {
        public static void main(String[] args) {
            int[] arr;
            arr = new int[4];
            System.out.println("arr[0]=" + arr[0]);
            System.out.println("arr[1]=" + arr[1]);
            System.out.println("arr[2]=" + arr[2]);
            System.out.println("数组长度是=" + arr.length);
        }
    }

